Dell Inspiron M511R (Mid 2011) - Manual (Page 30)

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Using Your Inspiron Laptop
Status Lights and Indicators
Battery Status Light
Indicator Light Status Computer State(s) Battery Charge Status
AC adapter solid white on/standby/off/
hibernate
charging
off on/standby/off/
hibernate
fully charged
Battery solid amber on/standby low battery (<= 10%)
off on/standby/off/
hibernate
not charging
NOTE: The battery is charging when the computer is powered using the AC adapter.